Spring-balanced transverse support for bed bottoms in bedsteads



July 2, 1929. f c. KRUMM 1,719,771v

SPRING BALANCE!) TRANSVERSE SUPPORT FOR BED BOTTOMS IN BFDSTEADSy Filed Dec. 29 1927 Patented July 2, 1929.

UNITED STATES PATENT OFFICE.

CARL KRUMM, OF HAMBURG, GERMANY.

SPRING-BALANCED TRANSVERSE SUPPORT `FOR BED `BO'ITLCJJMIS IN BEDSTEADS.

Application filed December 29, 1927, Serial No. 243,332, and in Germany January `26, 1926.

The present invention relates to an imn proved balanced transversal support lor bedbottoms in bedsteads at both ends ther-eet', the object in view bein to uniformly distribute the weight bearing ou the bed-bottom over the entire area ol' the latter, so that it will rise and descend without any tendency toward binding or amming.

Other objects aimed at are to secure enhaneed ease and comfort in resting on the bed-bottoms carried by the improved spring balanced transversal supports.

lith these and other objects in view the invention consists in the novel combination, arrangement and adaptation o't parts, all as more fully hereinafter explained, shown in the accompanying drawings and fully set out in the appended claim.

ln the dra-Wings,

Fig. 1 is a side elevation olf the improved springbalanced transversal support for bed` bottom,

Fig. 2 is a plan view of same,

Fig. 3 is a vertical cross section oli saine.

At both ends of the bedstead is provided for the bedbottom a spring balanced transversal support, which consists of a top rail 11 and of a bottom rail 12 spaced apartl but inovably connected together. Between these rails 11 and 12 are provided two or more interconnected compound lever ineclninisnis, which each consists o1" a set ot levers linked together to torni an articulated quadrangle.

According to Fig. 1, two such articulated quadrangles are employed, one at each extremity ci the spring balanced transversal support. The members 1?, 1st ol these articulated quadra-ngles are linked together by means of the pivot 15, which carried by the flange 16 of the top rail 11, the members 13, 14 being located at opposite sides ol? this flange 16. The members 17` 18 of these articulated quadrangles are linked together by means of the pivot 19, which is carried by the flange 20 ot the bottom rail 12, the members 17, 18 being located at opposite sides of this flange 20.

The members 13, 111 and the members 17, 18 of each articulated quadrangle are linked together by pivots 21 and 22. Bars 23, 211 are linked to the articulated quadrangles `termed ot' the members 13, 141, 17, 1S, the bar 23 interconnecting the members 13 and 18, the bar 24: interconnecting the members lil and 17. The bars 23, cross each other at the center of the articulated quadrangles, a

pivot 25 linking said bars together at the center. i

To `govern the movement ol` the top and bottom rails 11,` and 12 oi: each transversal sujiiport, an additional connection between said rails is provided, which simultaneously serves 'for sijn'ing` balancing the rails.

`This additional connection is ellected by means o't rods 2li, which in the example il.- lustrated in the drawings are fixed to thetop rail 11 and igienetrate,through holes in the. bottom rail 12, a splint or cotter pin 27 or the like at the tree extremity oli said bolts 2li preventing the latter jlroln disengaging the bottoni rail 12.

A plurality of the aforesaid rods 26 is distributed at equal distances apart over the entire length of the rails 11 and 12. Spiral springs 28 are coiled around the bolts 2G between the rails 11 and 12, the tension of these spiral springs 'forcing the rails 11 and [l2 apart as lar as thesplints or cotter pins 27 permit.

The hereinbeiiore described compound lever mechanisms which, with the rods 26, interconnect the rails 11, 12, are Asupported centrally of the articulated quadrangles, by the pivots 25 oi the respective bars 2?, 2li. As shown. in Figures 2 and 3,1:he said pivots 25 are formed by shafts journalled in lined bearings 3G on the transverse beams 7, 8.

The beams 7, 8 serve as carriers :tor the i1nproved spring balanced transversal supports, when saine are to be placed in a bedstead. The bedstead frame 9 is provided with longitudinal ledges 10 or equivalent brackets, on which the beams 7, 8 come to rest, as indicated in Fig. 3.

To equalize the movement of the rails 11 and 12 at both ends thereof, the artitailated quadrangles ol' each spring balanced trans versal support are interconnected by" means of rails 99, 30, the rail 29 interconnecting the pivots 21, the rail 30 interconnecting the piv ots 22, as shown in Fig. 1. The rail 29 is provided with a longitudinal slot 31, through which the pivot 25 et the articulated quadrangle at the left hand side of Fig. 1 penetrates. A corresponding slot 32 is provided in the rail 30, through which the pivot 25 of the articulated quadrangle at the right hand side ot Fig. 1 penetrates. By virtue of the slots 31, 82 the tivo rails 29, 3() are capable of reciprocal motion When the pivots 21, 22 move in contrary directions.

Studs 34 rise from the top rail 1l of the imm proved spring balanced transversal supports and serve for engaging holes in the transverse end rails of the bed-bottom, so as to fix the latter in its connection with the Aspring balanced transversal supports.

The .bed-bottom may be of any approved construction. V IVhen aweight is brought to bear on the bed-bottom, pressure is exerted on the top rail 1l of the two spring balanced transversal supports. By means of the articulated quadrangles the downward movement of the top rail ll caused by vthe aforesaid pressure against the tension of the springs 28, is translated into an upward movement of the bottom rail 12. In thus approaching one another. the two rails 1l and 12 force the articulated quadrangles formed by the compound lever mechanisms described to laterally extend. This lateralextension of the articulated quadrangles is equalizedby means of the rails 29, 30, which ensur-e a uniform motion at both y extremities of the spring balanced transversal supports, so that the bed-bottom will rise Vand descend without any tendency toward binding or amming.`

lVhen the bed-bottom is relieved of a weight that may have been brought to bear thereon, the springs 2S gain the power to return the two rails 11, l2 and the articulated quadrangles to their initial positions, the rails 29, 80 forcing the quadrangles to perform a uniform motion.

I wish it to he distinctly understood, that I do not limit myself to the precise constructions shown variations in the arrangement and combination of the several parts being possible according to desire or requirement without departing from the scope and spirit of the invention.

lVh at I do claim as my invention and desire to secure by Letters Patent is Improved spring balanced transversal support for bed-bottonis in bedsteads at both ends thereof, com prising a top rail and a bottom rail; a plurality of interconnected compound lever mechanisms, each consisting of a set of levers linked together to form an articulated quadrangle, movably connecting together the said top and bottom rail; means in central connection with and supporting the aforesaid articulated quadrangles so as to render the top and bottom rails capable of movement towards and away from each other; means for equalizing the movements of the articulated .f

quadrangles; and springs interposed between the topand bottom rails to return them and the articulated quadrangles to their initial position when the top rail is relieved of a weight that may have been brought to bear thereon, substantially as and for the purposes set forth.

In witness whereof I have hereunto signed my name.

CARL KRUMM. 

